1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
4 #include <linux/acpi.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/pm_runtime.h>
7 #include <linux/soundwire/sdw_registers.h>
8 #include <linux/soundwire/sdw.h>
12 * sdw_add_bus_master() - add a bus Master instance
15 * Initializes the bus instance, read properties and create child
18 int sdw_add_bus_master(struct sdw_bus *bus)
20 struct sdw_master_prop *prop = NULL;
24 pr_err("SoundWire bus has no device\n");
29 dev_err(bus->dev, "SoundWire Bus ops are not set\n");
33 mutex_init(&bus->msg_lock);
34 mutex_init(&bus->bus_lock);
35 INIT_LIST_HEAD(&bus->slaves);
36 INIT_LIST_HEAD(&bus->m_rt_list);
39 * Initialize multi_link flag
40 * TODO: populate this flag by reading property from FW node
42 bus->multi_link = false;
43 if (bus->ops->read_prop) {
44 ret = bus->ops->read_prop(bus);
47 "Bus read properties failed:%d\n", ret);
52 sdw_bus_debugfs_init(bus);
55 * Device numbers in SoundWire are 0 through 15. Enumeration device
56 * number (0), Broadcast device number (15), Group numbers (12 and
57 * 13) and Master device number (14) are not used for assignment so
58 * mask these and other higher bits.
61 /* Set higher order bits */
62 *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
64 /* Set enumuration device number and broadcast device number */
65 set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
66 set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
68 /* Set group device numbers and master device number */
69 set_bit(SDW_GROUP12_DEV_NUM, bus->assigned);
70 set_bit(SDW_GROUP13_DEV_NUM, bus->assigned);
71 set_bit(SDW_MASTER_DEV_NUM, bus->assigned);
74 * SDW is an enumerable bus, but devices can be powered off. So,
75 * they won't be able to report as present.
77 * Create Slave devices based on Slaves described in
78 * the respective firmware (ACPI/DT)
80 if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev))
81 ret = sdw_acpi_find_slaves(bus);
82 else if (IS_ENABLED(CONFIG_OF) && bus->dev->of_node)
83 ret = sdw_of_find_slaves(bus);
85 ret = -ENOTSUPP; /* No ACPI/DT so error out */
88 dev_err(bus->dev, "Finding slaves failed:%d\n", ret);
93 * Initialize clock values based on Master properties. The max
94 * frequency is read from max_clk_freq property. Current assumption
95 * is that the bus will start at highest clock frequency when
98 * Default active bank will be 0 as out of reset the Slaves have
99 * to start with bank 0 (Table 40 of Spec)
102 bus->params.max_dr_freq = prop->max_clk_freq * SDW_DOUBLE_RATE_FACTOR;
103 bus->params.curr_dr_freq = bus->params.max_dr_freq;
104 bus->params.curr_bank = SDW_BANK0;
105 bus->params.next_bank = SDW_BANK1;
109 EXPORT_SYMBOL(sdw_add_bus_master);
111 static int sdw_delete_slave(struct device *dev, void *data)
113 struct sdw_slave *slave = dev_to_sdw_dev(dev);
114 struct sdw_bus *bus = slave->bus;
116 sdw_slave_debugfs_exit(slave);
118 mutex_lock(&bus->bus_lock);
120 if (slave->dev_num) /* clear dev_num if assigned */
121 clear_bit(slave->dev_num, bus->assigned);
123 list_del_init(&slave->node);
124 mutex_unlock(&bus->bus_lock);
126 device_unregister(dev);
131 * sdw_delete_bus_master() - delete the bus master instance
132 * @bus: bus to be deleted
134 * Remove the instance, delete the child devices.
136 void sdw_delete_bus_master(struct sdw_bus *bus)
138 device_for_each_child(bus->dev, NULL, sdw_delete_slave);
140 sdw_bus_debugfs_exit(bus);
142 EXPORT_SYMBOL(sdw_delete_bus_master);
148 static inline int find_response_code(enum sdw_command_response resp)
154 case SDW_CMD_IGNORED:
157 case SDW_CMD_TIMEOUT:
165 static inline int do_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
167 int retry = bus->prop.err_threshold;
168 enum sdw_command_response resp;
171 for (i = 0; i <= retry; i++) {
172 resp = bus->ops->xfer_msg(bus, msg);
173 ret = find_response_code(resp);
175 /* if cmd is ok or ignored return */
176 if (ret == 0 || ret == -ENODATA)
183 static inline int do_transfer_defer(struct sdw_bus *bus,
185 struct sdw_defer *defer)
187 int retry = bus->prop.err_threshold;
188 enum sdw_command_response resp;
192 defer->length = msg->len;
193 init_completion(&defer->complete);
195 for (i = 0; i <= retry; i++) {
196 resp = bus->ops->xfer_msg_defer(bus, msg, defer);
197 ret = find_response_code(resp);
198 /* if cmd is ok or ignored return */
199 if (ret == 0 || ret == -ENODATA)
206 static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
208 int retry = bus->prop.err_threshold;
209 enum sdw_command_response resp;
212 for (i = 0; i <= retry; i++) {
213 resp = bus->ops->reset_page_addr(bus, dev_num);
214 ret = find_response_code(resp);
215 /* if cmd is ok or ignored return */
216 if (ret == 0 || ret == -ENODATA)
224 * sdw_transfer() - Synchronous transfer message to a SDW Slave device
226 * @msg: SDW message to be xfered
228 int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
232 mutex_lock(&bus->msg_lock);
234 ret = do_transfer(bus, msg);
235 if (ret != 0 && ret != -ENODATA)
236 dev_err(bus->dev, "trf on Slave %d failed:%d\n",
240 sdw_reset_page(bus, msg->dev_num);
242 mutex_unlock(&bus->msg_lock);
248 * sdw_transfer_defer() - Asynchronously transfer message to a SDW Slave device
250 * @msg: SDW message to be xfered
251 * @defer: Defer block for signal completion
253 * Caller needs to hold the msg_lock lock while calling this
255 int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
256 struct sdw_defer *defer)
260 if (!bus->ops->xfer_msg_defer)
263 ret = do_transfer_defer(bus, msg, defer);
264 if (ret != 0 && ret != -ENODATA)
265 dev_err(bus->dev, "Defer trf on Slave %d failed:%d\n",
269 sdw_reset_page(bus, msg->dev_num);
274 int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
275 u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf)
277 memset(msg, 0, sizeof(*msg));
278 msg->addr = addr; /* addr is 16 bit and truncated here */
280 msg->dev_num = dev_num;
284 if (addr < SDW_REG_NO_PAGE) { /* no paging area */
286 } else if (addr >= SDW_REG_MAX) { /* illegal addr */
287 pr_err("SDW: Invalid address %x passed\n", addr);
291 if (addr < SDW_REG_OPTIONAL_PAGE) { /* 32k but no page */
292 if (slave && !slave->prop.paging_support)
294 /* no need for else as that will fall-through to paging */
297 /* paging mandatory */
298 if (dev_num == SDW_ENUM_DEV_NUM || dev_num == SDW_BROADCAST_DEV_NUM) {
299 pr_err("SDW: Invalid device for paging :%d\n", dev_num);
304 pr_err("SDW: No slave for paging addr\n");
306 } else if (!slave->prop.paging_support) {
308 "address %x needs paging but no support\n", addr);
312 msg->addr_page1 = (addr >> SDW_REG_SHIFT(SDW_SCP_ADDRPAGE1_MASK));
313 msg->addr_page2 = (addr >> SDW_REG_SHIFT(SDW_SCP_ADDRPAGE2_MASK));
314 msg->addr |= BIT(15);
321 * sdw_nread() - Read "n" contiguous SDW Slave registers
323 * @addr: Register address
325 * @val: Buffer for values to be read
327 int sdw_nread(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
332 ret = sdw_fill_msg(&msg, slave, addr, count,
333 slave->dev_num, SDW_MSG_FLAG_READ, val);
337 ret = pm_runtime_get_sync(slave->bus->dev);
341 ret = sdw_transfer(slave->bus, &msg);
342 pm_runtime_put(slave->bus->dev);
346 EXPORT_SYMBOL(sdw_nread);
349 * sdw_nwrite() - Write "n" contiguous SDW Slave registers
351 * @addr: Register address
353 * @val: Buffer for values to be read
355 int sdw_nwrite(struct sdw_slave *slave, u32 addr, size_t count, u8 *val)
360 ret = sdw_fill_msg(&msg, slave, addr, count,
361 slave->dev_num, SDW_MSG_FLAG_WRITE, val);
365 ret = pm_runtime_get_sync(slave->bus->dev);
369 ret = sdw_transfer(slave->bus, &msg);
370 pm_runtime_put(slave->bus->dev);
374 EXPORT_SYMBOL(sdw_nwrite);
377 * sdw_read() - Read a SDW Slave register
379 * @addr: Register address
381 int sdw_read(struct sdw_slave *slave, u32 addr)
386 ret = sdw_nread(slave, addr, 1, &buf);
392 EXPORT_SYMBOL(sdw_read);
395 * sdw_write() - Write a SDW Slave register
397 * @addr: Register address
398 * @value: Register value
400 int sdw_write(struct sdw_slave *slave, u32 addr, u8 value)
402 return sdw_nwrite(slave, addr, 1, &value);
404 EXPORT_SYMBOL(sdw_write);
410 /* called with bus_lock held */
411 static struct sdw_slave *sdw_get_slave(struct sdw_bus *bus, int i)
413 struct sdw_slave *slave = NULL;
415 list_for_each_entry(slave, &bus->slaves, node) {
416 if (slave->dev_num == i)
423 static int sdw_compare_devid(struct sdw_slave *slave, struct sdw_slave_id id)
425 if (slave->id.mfg_id != id.mfg_id ||
426 slave->id.part_id != id.part_id ||
427 slave->id.class_id != id.class_id ||
428 (slave->id.unique_id != SDW_IGNORED_UNIQUE_ID &&
429 slave->id.unique_id != id.unique_id))
435 /* called with bus_lock held */
436 static int sdw_get_device_num(struct sdw_slave *slave)
440 bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
441 if (bit == SDW_MAX_DEVICES) {
447 * Do not update dev_num in Slave data structure here,
448 * Update once program dev_num is successful
450 set_bit(bit, slave->bus->assigned);
456 static int sdw_assign_device_num(struct sdw_slave *slave)
460 /* check first if device number is assigned, if so reuse that */
461 if (!slave->dev_num) {
462 mutex_lock(&slave->bus->bus_lock);
463 dev_num = sdw_get_device_num(slave);
464 mutex_unlock(&slave->bus->bus_lock);
466 dev_err(slave->bus->dev, "Get dev_num failed: %d\n",
471 dev_info(slave->bus->dev,
472 "Slave already registered dev_num:%d\n",
475 /* Clear the slave->dev_num to transfer message on device 0 */
476 dev_num = slave->dev_num;
480 ret = sdw_write(slave, SDW_SCP_DEVNUMBER, dev_num);
482 dev_err(&slave->dev, "Program device_num %d failed: %d\n",
487 /* After xfer of msg, restore dev_num */
488 slave->dev_num = dev_num;
493 void sdw_extract_slave_id(struct sdw_bus *bus,
494 u64 addr, struct sdw_slave_id *id)
496 dev_dbg(bus->dev, "SDW Slave Addr: %llx\n", addr);
500 * Register Bit Contents
501 * DevId_0 [7:4] 47:44 sdw_version
502 * DevId_0 [3:0] 43:40 unique_id
503 * DevId_1 39:32 mfg_id [15:8]
504 * DevId_2 31:24 mfg_id [7:0]
505 * DevId_3 23:16 part_id [15:8]
506 * DevId_4 15:08 part_id [7:0]
507 * DevId_5 07:00 class_id
509 id->sdw_version = (addr >> 44) & GENMASK(3, 0);
510 id->unique_id = (addr >> 40) & GENMASK(3, 0);
511 id->mfg_id = (addr >> 24) & GENMASK(15, 0);
512 id->part_id = (addr >> 8) & GENMASK(15, 0);
513 id->class_id = addr & GENMASK(7, 0);
516 "SDW Slave class_id %x, part_id %x, mfg_id %x, unique_id %x, version %x\n",
517 id->class_id, id->part_id, id->mfg_id,
518 id->unique_id, id->sdw_version);
521 static int sdw_program_device_num(struct sdw_bus *bus)
523 u8 buf[SDW_NUM_DEV_ID_REGISTERS] = {0};
524 struct sdw_slave *slave, *_s;
525 struct sdw_slave_id id;
531 /* No Slave, so use raw xfer api */
532 ret = sdw_fill_msg(&msg, NULL, SDW_SCP_DEVID_0,
533 SDW_NUM_DEV_ID_REGISTERS, 0, SDW_MSG_FLAG_READ, buf);
538 ret = sdw_transfer(bus, &msg);
539 if (ret == -ENODATA) { /* end of device id reads */
540 dev_dbg(bus->dev, "No more devices to enumerate\n");
545 dev_err(bus->dev, "DEVID read fail:%d\n", ret);
550 * Construct the addr and extract. Cast the higher shift
551 * bits to avoid truncation due to size limit.
553 addr = buf[5] | (buf[4] << 8) | (buf[3] << 16) |
554 ((u64)buf[2] << 24) | ((u64)buf[1] << 32) |
557 sdw_extract_slave_id(bus, addr, &id);
559 /* Now compare with entries */
560 list_for_each_entry_safe(slave, _s, &bus->slaves, node) {
561 if (sdw_compare_devid(slave, id) == 0) {
565 * Assign a new dev_num to this Slave and
566 * not mark it present. It will be marked
567 * present after it reports ATTACHED on new
570 ret = sdw_assign_device_num(slave);
572 dev_err(slave->bus->dev,
573 "Assign dev_num failed:%d\n",
583 /* TODO: Park this device in Group 13 */
584 dev_err(bus->dev, "Slave Entry not found\n");
590 * Check till error out or retry (count) exhausts.
591 * Device can drop off and rejoin during enumeration
592 * so count till twice the bound.
595 } while (ret == 0 && count < (SDW_MAX_DEVICES * 2));
600 static void sdw_modify_slave_status(struct sdw_slave *slave,
601 enum sdw_slave_status status)
603 mutex_lock(&slave->bus->bus_lock);
604 slave->status = status;
605 mutex_unlock(&slave->bus->bus_lock);
608 int sdw_configure_dpn_intr(struct sdw_slave *slave,
609 int port, bool enable, int mask)
615 addr = SDW_DPN_INTMASK(port);
617 /* Set/Clear port ready interrupt mask */
620 val |= SDW_DPN_INT_PORT_READY;
623 val &= ~SDW_DPN_INT_PORT_READY;
626 ret = sdw_update(slave, addr, (mask | SDW_DPN_INT_PORT_READY), val);
628 dev_err(slave->bus->dev,
629 "SDW_DPN_INTMASK write failed:%d\n", val);
634 static int sdw_initialize_slave(struct sdw_slave *slave)
636 struct sdw_slave_prop *prop = &slave->prop;
641 * Set bus clash, parity and SCP implementation
642 * defined interrupt mask
643 * TODO: Read implementation defined interrupt mask
644 * from Slave property
646 val = SDW_SCP_INT1_IMPL_DEF | SDW_SCP_INT1_BUS_CLASH |
649 /* Enable SCP interrupts */
650 ret = sdw_update(slave, SDW_SCP_INTMASK1, val, val);
652 dev_err(slave->bus->dev,
653 "SDW_SCP_INTMASK1 write failed:%d\n", ret);
657 /* No need to continue if DP0 is not present */
658 if (!slave->prop.dp0_prop)
661 /* Enable DP0 interrupts */
662 val = prop->dp0_prop->imp_def_interrupts;
663 val |= SDW_DP0_INT_PORT_READY | SDW_DP0_INT_BRA_FAILURE;
665 ret = sdw_update(slave, SDW_DP0_INTMASK, val, val);
667 dev_err(slave->bus->dev,
668 "SDW_DP0_INTMASK read failed:%d\n", ret);
675 static int sdw_handle_dp0_interrupt(struct sdw_slave *slave, u8 *slave_status)
677 u8 clear = 0, impl_int_mask;
678 int status, status2, ret, count = 0;
680 status = sdw_read(slave, SDW_DP0_INT);
682 dev_err(slave->bus->dev,
683 "SDW_DP0_INT read failed:%d\n", status);
688 if (status & SDW_DP0_INT_TEST_FAIL) {
689 dev_err(&slave->dev, "Test fail for port 0\n");
690 clear |= SDW_DP0_INT_TEST_FAIL;
694 * Assumption: PORT_READY interrupt will be received only for
695 * ports implementing Channel Prepare state machine (CP_SM)
698 if (status & SDW_DP0_INT_PORT_READY) {
699 complete(&slave->port_ready[0]);
700 clear |= SDW_DP0_INT_PORT_READY;
703 if (status & SDW_DP0_INT_BRA_FAILURE) {
704 dev_err(&slave->dev, "BRA failed\n");
705 clear |= SDW_DP0_INT_BRA_FAILURE;
708 impl_int_mask = SDW_DP0_INT_IMPDEF1 |
709 SDW_DP0_INT_IMPDEF2 | SDW_DP0_INT_IMPDEF3;
711 if (status & impl_int_mask) {
712 clear |= impl_int_mask;
713 *slave_status = clear;
716 /* clear the interrupt */
717 ret = sdw_write(slave, SDW_DP0_INT, clear);
719 dev_err(slave->bus->dev,
720 "SDW_DP0_INT write failed:%d\n", ret);
724 /* Read DP0 interrupt again */
725 status2 = sdw_read(slave, SDW_DP0_INT);
727 dev_err(slave->bus->dev,
728 "SDW_DP0_INT read failed:%d\n", status2);
735 /* we can get alerts while processing so keep retrying */
736 } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
738 if (count == SDW_READ_INTR_CLEAR_RETRY)
739 dev_warn(slave->bus->dev, "Reached MAX_RETRY on DP0 read\n");
744 static int sdw_handle_port_interrupt(struct sdw_slave *slave,
745 int port, u8 *slave_status)
747 u8 clear = 0, impl_int_mask;
748 int status, status2, ret, count = 0;
752 return sdw_handle_dp0_interrupt(slave, slave_status);
754 addr = SDW_DPN_INT(port);
755 status = sdw_read(slave, addr);
757 dev_err(slave->bus->dev,
758 "SDW_DPN_INT read failed:%d\n", status);
764 if (status & SDW_DPN_INT_TEST_FAIL) {
765 dev_err(&slave->dev, "Test fail for port:%d\n", port);
766 clear |= SDW_DPN_INT_TEST_FAIL;
770 * Assumption: PORT_READY interrupt will be received only
771 * for ports implementing CP_SM.
773 if (status & SDW_DPN_INT_PORT_READY) {
774 complete(&slave->port_ready[port]);
775 clear |= SDW_DPN_INT_PORT_READY;
778 impl_int_mask = SDW_DPN_INT_IMPDEF1 |
779 SDW_DPN_INT_IMPDEF2 | SDW_DPN_INT_IMPDEF3;
781 if (status & impl_int_mask) {
782 clear |= impl_int_mask;
783 *slave_status = clear;
786 /* clear the interrupt */
787 ret = sdw_write(slave, addr, clear);
789 dev_err(slave->bus->dev,
790 "SDW_DPN_INT write failed:%d\n", ret);
794 /* Read DPN interrupt again */
795 status2 = sdw_read(slave, addr);
797 dev_err(slave->bus->dev,
798 "SDW_DPN_INT read failed:%d\n", status2);
805 /* we can get alerts while processing so keep retrying */
806 } while (status != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
808 if (count == SDW_READ_INTR_CLEAR_RETRY)
809 dev_warn(slave->bus->dev, "Reached MAX_RETRY on port read");
814 static int sdw_handle_slave_alerts(struct sdw_slave *slave)
816 struct sdw_slave_intr_status slave_intr;
817 u8 clear = 0, bit, port_status[15] = {0};
818 int port_num, stat, ret, count = 0;
820 bool slave_notify = false;
821 u8 buf, buf2[2], _buf, _buf2[2];
823 sdw_modify_slave_status(slave, SDW_SLAVE_ALERT);
825 /* Read Instat 1, Instat 2 and Instat 3 registers */
826 ret = sdw_read(slave, SDW_SCP_INT1);
828 dev_err(slave->bus->dev,
829 "SDW_SCP_INT1 read failed:%d\n", ret);
834 ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, buf2);
836 dev_err(slave->bus->dev,
837 "SDW_SCP_INT2/3 read failed:%d\n", ret);
843 * Check parity, bus clash and Slave (impl defined)
846 if (buf & SDW_SCP_INT1_PARITY) {
847 dev_err(&slave->dev, "Parity error detected\n");
848 clear |= SDW_SCP_INT1_PARITY;
851 if (buf & SDW_SCP_INT1_BUS_CLASH) {
852 dev_err(&slave->dev, "Bus clash error detected\n");
853 clear |= SDW_SCP_INT1_BUS_CLASH;
857 * When bus clash or parity errors are detected, such errors
858 * are unlikely to be recoverable errors.
859 * TODO: In such scenario, reset bus. Make this configurable
860 * via sysfs property with bus reset being the default.
863 if (buf & SDW_SCP_INT1_IMPL_DEF) {
864 dev_dbg(&slave->dev, "Slave impl defined interrupt\n");
865 clear |= SDW_SCP_INT1_IMPL_DEF;
869 /* Check port 0 - 3 interrupts */
870 port = buf & SDW_SCP_INT1_PORT0_3;
872 /* To get port number corresponding to bits, shift it */
873 port = port >> SDW_REG_SHIFT(SDW_SCP_INT1_PORT0_3);
874 for_each_set_bit(bit, &port, 8) {
875 sdw_handle_port_interrupt(slave, bit,
879 /* Check if cascade 2 interrupt is present */
880 if (buf & SDW_SCP_INT1_SCP2_CASCADE) {
881 port = buf2[0] & SDW_SCP_INTSTAT2_PORT4_10;
882 for_each_set_bit(bit, &port, 8) {
883 /* scp2 ports start from 4 */
885 sdw_handle_port_interrupt(slave,
887 &port_status[port_num]);
891 /* now check last cascade */
892 if (buf2[0] & SDW_SCP_INTSTAT2_SCP3_CASCADE) {
893 port = buf2[1] & SDW_SCP_INTSTAT3_PORT11_14;
894 for_each_set_bit(bit, &port, 8) {
895 /* scp3 ports start from 11 */
897 sdw_handle_port_interrupt(slave,
899 &port_status[port_num]);
903 /* Update the Slave driver */
904 if (slave_notify && slave->ops &&
905 slave->ops->interrupt_callback) {
906 slave_intr.control_port = clear;
907 memcpy(slave_intr.port, &port_status,
908 sizeof(slave_intr.port));
910 slave->ops->interrupt_callback(slave, &slave_intr);
914 ret = sdw_write(slave, SDW_SCP_INT1, clear);
916 dev_err(slave->bus->dev,
917 "SDW_SCP_INT1 write failed:%d\n", ret);
922 * Read status again to ensure no new interrupts arrived
923 * while servicing interrupts.
925 ret = sdw_read(slave, SDW_SCP_INT1);
927 dev_err(slave->bus->dev,
928 "SDW_SCP_INT1 read failed:%d\n", ret);
933 ret = sdw_nread(slave, SDW_SCP_INTSTAT2, 2, _buf2);
935 dev_err(slave->bus->dev,
936 "SDW_SCP_INT2/3 read failed:%d\n", ret);
940 /* Make sure no interrupts are pending */
944 stat = buf || buf2[0] || buf2[1];
947 * Exit loop if Slave is continuously in ALERT state even
948 * after servicing the interrupt multiple times.
952 /* we can get alerts while processing so keep retrying */
953 } while (stat != 0 && count < SDW_READ_INTR_CLEAR_RETRY);
955 if (count == SDW_READ_INTR_CLEAR_RETRY)
956 dev_warn(slave->bus->dev, "Reached MAX_RETRY on alert read\n");
961 static int sdw_update_slave_status(struct sdw_slave *slave,
962 enum sdw_slave_status status)
964 if (slave->ops && slave->ops->update_status)
965 return slave->ops->update_status(slave, status);
971 * sdw_handle_slave_status() - Handle Slave status
972 * @bus: SDW bus instance
973 * @status: Status for all Slave(s)
975 int sdw_handle_slave_status(struct sdw_bus *bus,
976 enum sdw_slave_status status[])
978 enum sdw_slave_status prev_status;
979 struct sdw_slave *slave;
982 if (status[0] == SDW_SLAVE_ATTACHED) {
983 dev_dbg(bus->dev, "Slave attached, programming device number\n");
984 ret = sdw_program_device_num(bus);
986 dev_err(bus->dev, "Slave attach failed: %d\n", ret);
988 * programming a device number will have side effects,
989 * so we deal with other devices at a later time
994 /* Continue to check other slave statuses */
995 for (i = 1; i <= SDW_MAX_DEVICES; i++) {
996 mutex_lock(&bus->bus_lock);
997 if (test_bit(i, bus->assigned) == false) {
998 mutex_unlock(&bus->bus_lock);
1001 mutex_unlock(&bus->bus_lock);
1003 slave = sdw_get_slave(bus, i);
1007 switch (status[i]) {
1008 case SDW_SLAVE_UNATTACHED:
1009 if (slave->status == SDW_SLAVE_UNATTACHED)
1012 sdw_modify_slave_status(slave, SDW_SLAVE_UNATTACHED);
1015 case SDW_SLAVE_ALERT:
1016 ret = sdw_handle_slave_alerts(slave);
1019 "Slave %d alert handling failed: %d\n",
1023 case SDW_SLAVE_ATTACHED:
1024 if (slave->status == SDW_SLAVE_ATTACHED)
1027 prev_status = slave->status;
1028 sdw_modify_slave_status(slave, SDW_SLAVE_ATTACHED);
1030 if (prev_status == SDW_SLAVE_ALERT)
1033 ret = sdw_initialize_slave(slave);
1036 "Slave %d initialization failed: %d\n",
1042 dev_err(bus->dev, "Invalid slave %d status:%d\n",
1047 ret = sdw_update_slave_status(slave, status[i]);
1049 dev_err(slave->bus->dev,
1050 "Update Slave status failed:%d\n", ret);
1055 EXPORT_SYMBOL(sdw_handle_slave_status);